Replacing a Valve

Preparations

Turn off all shut off screws (see video)

Remove the bottom plate (PH10-27) by unscrewing all 5 screws (PH10-7)
Find the valve (PH10-89) to replace, the numbers above the valves (PH10-89) correspond to the numbers on the manifold
Remove the two screws (PH10-3) on the button plate (PH10-2) and remove the button plate (PH10-2)
Remove the two screws (PH10-7) holding the butterfly plates (PH10-9-1HR | PH10-9-1HL | PH10-9-2 | PH10-9-3HL | PH10-9-3HR) and then remove them
Remove the stem retainers (PH10-XXX)
Turn the hat (PH10-125) with a screwdriver and remove the hat (PH10-19), spring (PH10-24) and the O-ring (PH10-29) from the valve chamber
On the valve that you intend to replace, using a screw driver press the stem pushing the valve through the chamber
Insert the new valve into the chamber
Re-insert the hat and hat o-ring by turning the hat 90 degrees locking the wings of the hat (PH10-125) under the edge of the handle (PH10-113)
Reattach the bottom plate (PH10-27) by screwing in the five screws (PH10-7) (Don't overtighten)
Replace the stem O-ring retainers (PH10-52 or PH10-110) ensuring that the crossed side of the retainers is facing up.
Place the butterfly plates (PH10-9-XX) onto the handle (PH10-113)
Reinsert the butterfly screws (PH10-7) and butterfly retainer (PH10-8) and screw tightly (don't overtighten!), make sure the butterflies (PH10-9-XX) are snuggly seated
Place button plate (PH10-2) back on the handle and tighten screws

Reactivate the pressure to the bargun by turning the shutoff switches to the open position.

Test the handle for any leakage.